Tetrahydrocannabinol (THC), is the main psychoactive ingredient in the Cannabis Sativa plant that gets a user 'High'.
It's scientific name is &#916;9-tetrahydrocannabinol (delta-9-tetrahydrocannabinol), &#916;¹-tetrahydrocannabinol (using an older numbering scheme), or dronabinol, is the main psychoactive substance found in the Cannabis plant. It was isolated by Raphael Mechoulam and Yechiel Gaoni from the Weizmann Institute in Rehovot, Israel in 1964. In pure form it is a glassy solid when cold and becomes viscous and sticky if warmed. THC has a very low solubility in water, but a good solubility in most organic solvents such as pure ethanol or hexane.